Friction and Wear Properties of a New Semi-Metallic Brake Pad According to SAE J 661: A Case Study in PARSLENT Complex (Iran)

Hamid Reza Akramifard, Zahra Ghasemi

Semi-metallic brake pads comprising different friction materials with determined proportions were designed.  SAE J 661 was selected to evaluate friction and wear behavior of these brake pads. The average friction coefficient of seven wear stages i.e. first baseline, first fade, first recovery, wear, second baseline, second fade and second recovery were 0.371, 0.363, 0.352, 0.374, 0.390, 0.362 and 0.353 respectively. All friction coefficients of these stages were in the range of 0.35-0.45, which were accordance to standard. Moreover normal and hot friction coefficients of brake pads were 0.364 and 0.352 respectively. As a result new semi-metallic brake pads gained F class category of friction coefficient classification. Finally the percentage of wear rate after seven wear stages was 1.67% which satisfied wear rate principle of SAE J 661.